Symbiotic

Description:
Symbiotic will show a second and a third tooltip with information on what spells
you get from a class, and what spells you give to a class through Symbiosis.

To show these extra tooltips, just hold shift when hovering over a player.
The second tooltip (showing what you would give) only shows when the
player is within inspecting range, this is limited by the game.

Notes:
The coloring of the player specialization in the second tooltip is compatible with Class Colors.
Also, most addons that skin tooltips will also skin this one.

Symbiosis:
Mass Dispel's mana cost has been increased to match the Priest version, and its cooldown has been increased to 60 seconds.
The cast time of Symbiosis has been reduced to 2 seconds.
Survival Instincts is once again granted to Brewmaster Monks and now costs 2 Chi to use.
Might of Ursoc is once again granted to Blood Death Knights, and now costs 30 Runic Power.
Savage Defense is once again granted to Protection Warriors, but now only provides a 30% increase to dodge.
Barkskin is once again granted to Protection Paladins, and now costs 1 Holy Power.
The cooldown of Stampeding Shout provided by Symbiosis has been reduced to 5 minutes.
The duration of Solar Beam provided by Symbiosis now displays correctly as 4 seconds.

It's a great addon but it'd be even better if you could make it more compact. It takes a lot of real screen estate.

There are other addons that can do this in a more compact way, but this is how I wanted to do it with this one.
Also, with 1920x1080 resolution, nothing really takes up much space, especially not 3 tooltips.